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Q.

A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object when the image is virtual will be

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a

22.5 cm

b

7.5 cm

c

30 cm

d

45 cm

answer is B.

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Detailed Solution

f=−15cm, m=+2 (Positive because image is virtual) ∵m=−vu⇒v=−2u. By using mirror formula  1−15=1(−2u)+1u⇒u=−7.5cm
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